Add Brendan Horan to CODEOWNERS

[xv-brendan-h]

Description

Update the GitHub CODEOWNERS file to include Brendan Horan. Fix large white-space present in file.

Reference: https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/about-code-owners

How Has This Been Tested?

View the CODEOWNERS file in the GIthub UI and see that it makes it as valid

Types of change

• [x] Repository config

[CLAassistant]

All committers have signed the CLA.